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    <title>Document</title>
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<script>
    var obj = { name:'李煜',age:30,sex:true,hobby:['打球','听音乐'] };
    //实现json对象的深拷贝
    function copyObj(obj) {
        //判断obj是否是数组类型，如果是数组类型，则obj2被初始化为空数组，否则初始化为空对象
        var obj2 = Array.isArray(obj) ? [] : {}
        //key是属性名，obj[key]是属性值
        for (var key in obj) {
            //判断key属性的值是否是引用类型，如果是，则需要继续循环遍历处理该属性的值（递归处理）
            if (typeof obj[key] == 'object') {
                obj2[key] = copyObj(obj[key])
            } else {//key的属性值不是引用类型，直接拷贝该属性的值
                obj[key] = obj[key]
            }
        }
        return obj2
    }
    var obj2 = copyObj(obj)
    console.log( obj, obj2 );
</script>